Rav Moshe writes in the Igros Moshe that it is midas sdom for the producer to be makpid on copying if it causes him no loss.
Btw, looking at Rav Belsky’s position in greater depth indicates Rav Belsky holds the issue is hasagas gvul and not halachic gezeila.
And I disagree with Menachem’s reasoning to not discuss this. You could use that reasoning to discontinue all halachic discussions here. And we are discussing the permissiveness on this issue exclusively limited to where the producer does not lose any sale. All other circumstances we all agree it is prohibited to copy.